Alex and Lee continue their games with piles of stones. There are a number of piles arranged in a row, and each pile has a positive integer number of ...

Alex and Lee play a game with piles of stones. There are an even number of piles arranged in a row, and each pile has a positive integer number of st ...

Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst all the balloon ...

On an N x N grid, each square grid[i][j] represents the elevation at that point (i,j). Now rain starts to fall. At time t, the depth of the water ever ...

Given an integer matrix, find the length of the longest increasing path. From each cell, you can either move to four directions: left, right, up or do ...

Given an array A of 0s and 1s, we may change up to K values from 0 to 1. Return the length of the longest (contiguous) subarray that contains only 1s. ...

Given a binary array, find the maximum number of consecutive 1s in this array if you can flip at most one 0. Note The input array will only contain 0 ...

Given a binary array, find the maximum number of consecutive 1s in this array. ExampleInput: [1,1,0,1,1,1] Output: 3 Explanation: The first two digits ...

There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up (u), down (d), left (l) or right (r), but it ...

Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list – wh ...